FR-F700 INSTRUCTION MANUAL (BASIC) - MRO Stop

Precautions for use of the inverter(13) If the machine must not be restarted when power is restored after a power failure, provide a magnetic contactor in theinverter's input side and also make up a sequence which will not switch on the start signal.If the start signal (start switch) remains on after a power failure, the inverter will automatically restart as soon as thepower is restored.(14) Instructions for overload operationWhen performing an operation of frequent start/stop of the inverter, increase/decrease in the temperature of thetransistor element of the inverter may repeat due to a continuous flow of large current, shortening the life from thermalfatigue. Since thermal fatigue is related to the amount of current, the life can be increased by reducing bound current,starting current, etc. Decreasing current may increase the life. However, decreasing current will result in insufficienttorque and the inverter may not start. Therefore, increase the inverter capacity to have enough allowance for current.(15) Make sure that the specifications and rating match the system requirements.(16) When the motor speed is unstable, due to change in the frequency setting signal caused by electromagnetic noises fromthe inverter, take the following measures when applying the motor speed by the analog signal.· Do not run the signal cables and power cables (inverter I/O cables) in parallel with each other and do not bundle them.· Run signal cables as far away as possible from power cables (inverter I/O cables).· Use shield cables as signal cables.· Install a ferrite core on the signal cable (Example: ZCAT3035-1330 TDK).2INSTALLATION AND WIRING29